Anomalous Superfluidity in (2+1)-Dimensional Two-Color Lattice QCD

Shailesh Chandrasekharan
Phys. Rev. Lett. 97, 182001 – Published 31 October 2006

Abstract

We study thermodynamics of strongly coupled lattice QCD with two colors of staggered fermions in 2+1 dimensions. The partition function of this model can be written elegantly as a statistical mechanics of dimers and baryon loops. The model is invariant under an SO(3)×U(1) symmetry. At low temperatures, we find evidence for superfluidity in the U(1) symmetry sector while the SO(3) symmetry remains unbroken. The finite temperature phase transition appears to belong to the Kosterlitz-Thouless universality class, but the superfluid density jump ρs(Tc) at the critical temperature Tc is anomalously higher than the normal value of 2Tc/π. We show that, by adding a small SO(3) symmetry breaking term to the model, the superfluid density jump returns to its normal value, implying that the extra symmetry causes anomalous superfluid behavior. Our results may be of interest to researchers studying superfluidity in spin-1 systems.

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  • Received 23 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.182001

©2006 American Physical Society

Authors & Affiliations

Shailesh Chandrasekharan

  • Department of Physics, Box 90305, Duke University, Durham, North Carolina 27708, USA

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Issue

Vol. 97, Iss. 18 — 3 November 2006

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